Note that only the BI Documenter Database and Enterprise editions support this feature.
BI Documenter features a built-in diagram editor that you can use to document your solutions. The diagram tool features a data-driven palette of objects to assist you in graphically conveying your Business Intelligence architecture.
To add a new diagram select the "Diagrams" tab of the "Finalize Document" step.
Click the "New Diagram" button to create a new diagram and launch the diagram editor.